Point of Shark Jump: When Did Any Given Television Show Jump?

The original jumptheshark.com was an interesting reference for understanding how people view TV shows. Given that the site has been defunct for years, what are your observations about when any given TV show "jumped the shark"?

From wikipedia:

"Jumping the shark" is an expression that means something may have peaked in value. Historically, it was a pejorativeidiom used to describe a moment of television in which there is a gimmick or unlikely occurrence that is seen as a desperate attempt to keep viewers' interest. Therefore, moments labeled as "jumping the shark" are often considered indications that the writers have run out of ideas; that the show has strayed irretrievably from an older and better formula; and/or even that the series as a whole is declining in quality.

Roseanne- When the family got rich
thirtysomething- Killed off Gary
Miami Vice- Blew up Sonny's car
Grey's Anatomy-Lots of different things, the main one killing off Derek Shepard.
Laverne and Shirley-Going to California
Homicide- Pembleton's stroke

Ally McBeal
The episode where Billy and Georgia got into an argument in the Unisex and Georgia punches Billy so hard that he flies across the room, hits the wall, and falls to the floor unconscious. The scene might have been intended to be funny, but it came across as so mean that the show was never the same.

Scooby Doo
Although the Jump The Shark website lists the introduction of Scrappy Doo as the moment the series jumped the shark, I think it actually jumped the shark during The New Scooby Doo Movies where they meet up with Jeannie (from the I Dream Of Jeannie animated series). What set that episode apart is that for the first time an actual supernatural being was the guilty party rather than a normal human using a disguise and/or technology, which is one of the key elements of the series. This later led to more episodes/movies where the team deals with the actual supernatural.

Fantasy Island
The departure of Tattoo.

The Jetsons
The introduction of Orbity (along with the new episodes). The new episodes didn't have the same feel as the original 1960s episodes.

Doctor Who (With this series, I will treat each Doctor's run as a separate series since I don't think the series jumped the shark during the run of most of the Doctors)
The Fourth Doctor (Tom Baker): The introduction of Romana II.

Teen Titans
The fifth (and final) season were the main team disappears from the series for the most part and other teen heroes appear instead.

The above episode is where the phrase "Jump The Shark" came from. According to the book Jump The Shark by John Hein, he and a group of guys were discussing when their favorite television shows were never the same. Although there were arguments with many shows, when someone mentioned the above episode of Happy Days, where Fonzie literally jumped the shark, there was silence and no arguments. Hein later created a website called Jump The Shark where people can post they own opinions about when shows jumped the shark.